Symptoms

Consider the following scenario:

  • You create some tasks in Task Scheduler on a computer that is running Windows Server 2008 or Windows Vista. Some of these tasks are randomly delayed tasks.

    Note To create a randomly delayed task in Task Scheduler, click to select the Delay task for up to (random delay) check box, and then specify a time period from the drop-down menu.

  • You use a time-based trigger to run these tasks at some scheduled times.

In this scenario, some tasks that are not randomly delayed tasks are postponed until the randomly delayed tasks are processed.

Cause

This issue occurs because Task Scheduler does not handle the random delayed tasks correctly when Task Scheduler evaluates jobs that should be started within a time period. This behavior causes some tasks that are not randomly delayed tasks not to run at the specified time. These jobs are started as missed schedules when the randomly delayed tasks are processed some time later.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows Server 2008 Service Pack 2 (SP2)

  • Windows Server 2008

  • Windows Vista Service Pack 2 (SP2)

  • Windows Vista Service Pack 1 (SP1)

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.600 1 . 22xxx

    Windows Vista and Windows Server 2008

    SP1

    LDR

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into the release version of Windows Server 2008.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Tmm.dll

6.0.6001.22691

1,298,432

13-May-2010

17:16

x86

Tmm.dll

6.0.6002.22404

1,298,432

13-May-2010

18:28

x86

Taskeng.exe

6.0.6001.22691

169,984

13-May-2010

15:38

x86

Taskeng.mof

Not applicable

2,254

04-Mar-2010

06:02

Not applicable

Taskeng.exe

6.0.6002.22404

169,984

13-May-2010

16:01

x86

Taskeng.mof

Not applicable

2,254

03-Apr-2009

21:40

Not applicable

Schedsvc.dll

6.0.6001.22691

598,016

13-May-2010

17:16

x86

Schedsvc.mof

Not applicable

2,250

04-Mar-2010

06:02

Not applicable

Schedsvc.dll

6.0.6002.22404

595,968

13-May-2010

18:27

x86

Schedsvc.mof

Not applicable

2,250

03-Apr-2009

21:40

Not applicable

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Tmm.dll

6.0.6001.22691

1,319,424

13-May-2010

17:35

x64

Tmm.dll

6.0.6002.22404

1,319,424

13-May-2010

18:27

x64

Taskeng.exe

6.0.6001.22691

265,216

13-May-2010

15:56

x64

Taskeng.mof

Not applicable

2,254

26-Feb-2010

04:20

Not applicable

Taskeng.exe

6.0.6002.22404

265,216

13-May-2010

16:14

x64

Taskeng.mof

Not applicable

2,254

03-Apr-2009

21:04

Not applicable

Schedsvc.dll

6.0.6001.22691

844,800

13-May-2010

17:34

x64

Schedsvc.mof

Not applicable

2,250

26-Feb-2010

04:20

Not applicable

Schedsvc.dll

6.0.6002.22404

844,800

13-May-2010

18:26

x64

Schedsvc.mof

Not applicable

2,250

03-Apr-2009

21:04

Not applicable

For all supported IA-64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Taskeng.exe

6.0.6001.22691

518,656

13-May-2010

15:43

IA-64

Taskeng.mof

Not applicable

2,254

25-Feb-2010

07:47

Not applicable

Taskeng.exe

6.0.6002.22404

518,656

13-May-2010

16:08

IA-64

Taskeng.mof

Not applicable

2,254

03-Apr-2009

21:04

Not applicable

Schedsvc.dll

6.0.6001.22691

1,397,248

13-May-2010

17:17

IA-64

Schedsvc.mof

Not applicable

2,250

25-Feb-2010

07:47

Not applicable

Schedsvc.dll

6.0.6002.22404

1,397,248

13-May-2010

18:13

IA-64

Schedsvc.mof

Not applicable

2,250

03-Apr-2009

21:04

Not applicable

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about Task Scheduler, visit the following Microsoft website:

An overview of Task SchedulerFor more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

File name

Update.mum

File version

Not applicable

File size

3,433

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_09b697a3c611bb2610697140bf76d32d_31bf3856ad364e35_6.0.6002.22404_none_e0d9325a726e503d.manifest

File version

Not applicable

File size

700

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_0fb93644f9a1d2d14afeb90c66f0e54f_31bf3856ad364e35_6.0.6002.22404_none_c5f8d3f6582ea1bb.manifest

File version

Not applicable

File size

709

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_1a247aaffe44395481d6539ffe024e07_31bf3856ad364e35_6.0.6001.22691_none_6dbbc2108cbfad9a.manifest

File version

Not applicable

File size

709

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_7718191a0bb20fb5e468882d6757207d_31bf3856ad364e35_6.0.6002.22404_none_9d6137e22a936e78.manifest

File version

Not applicable

File size

708

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_bcc98193b971ba38042c6c86185c5113_31bf3856ad364e35_6.0.6001.22691_none_9b157fc0882189a6.manifest

File version

Not applicable

File size

700

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_df2b8076741ea2ead74271f25595cf58_31bf3856ad364e35_6.0.6001.22691_none_ac08233a93cb3788.manifest

File version

Not applicable

File size

708

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

X86_microsoft-windows-mobilepc-tmm_31bf3856ad364e35_6.0.6001.22691_none_14889336d8b79ec9.manifest

File version

Not applicable

File size

10,104

Date (UTC)

13-May-2010

Time (UTC)

18:57

Platform

Not applicable


File name

X86_microsoft-windows-mobilepc-tmm_31bf3856ad364e35_6.0.6002.22404_none_16d3572ed59241a0.manifest

File version

Not applicable

File size

10,104

Date (UTC)

13-May-2010

Time (UTC)

20:08

Platform

Not applicable


File name

X86_microsoft-windows-taskscheduler-engine_31bf3856ad364e35_6.0.6001.22691_none_e5d5a475d84013b4.manifest

File version

Not applicable

File size

8,325

Date (UTC)

13-May-2010

Time (UTC)

19:00

Platform

Not applicable


File name

X86_microsoft-windows-taskscheduler-engine_31bf3856ad364e35_6.0.6002.22404_none_e820686dd51ab68b.manifest

File version

Not applicable

File size

8,325

Date (UTC)

13-May-2010

Time (UTC)

20:11

Platform

Not applicable


File name

X86_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6001.22691_none_2f2a75d8b0681f15.manifest

File version

Not applicable

File size

116,561

Date (UTC)

13-May-2010

Time (UTC)

19:00

Platform

Not applicable


File name

X86_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6002.22404_none_317539d0ad42c1ec.manifest

File version

Not applicable

File size

116,561

Date (UTC)

13-May-2010

Time (UTC)

20:11

Platform

Not applicable

Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

File name

Update.mum

File version

Not applicable

File size

3,461

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_24264e9cc8adf022a5719f871af48295_31bf3856ad364e35_6.0.6001.22691_none_d4d2406b9651ff3b.manifest

File version

Not applicable

File size

1,064

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_6882c4977f066b58ed623cf85b4e9989_31bf3856ad364e35_6.0.6002.22404_none_24a21b1c3692e43c.manifest

File version

Not applicable

File size

1,048

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_6d3f6d776f0b287cac85fc92efdba81a_31bf3856ad364e35_6.0.6001.22691_none_34b4064ec0f3af2a.manifest

File version

Not applicable

File size

1,048

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_7799d1909b7385b1aa13128c43c45c93_31bf3856ad364e35_6.0.6001.22691_none_2956be134bc39e43.manifest

File version

Not applicable

File size

1,068

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_a2e38c556a58ab3d27aec10796052a38_31bf3856ad364e35_6.0.6002.22404_none_2179e596318c6303.manifest

File version

Not applicable

File size

1,064

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_fa082cee5210e0db7ad8155d534bdaef_31bf3856ad364e35_6.0.6002.22404_none_e072f112a1df78bf.manifest

File version

Not applicable

File size

1,068

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Amd64_microsoft-windows-mobilepc-tmm_31bf3856ad364e35_6.0.6001.22691_none_70a72eba91150fff.manifest

File version

Not applicable

File size

10,444

Date (UTC)

13-May-2010

Time (UTC)

19:16

Platform

Not applicable


File name

Amd64_microsoft-windows-mobilepc-tmm_31bf3856ad364e35_6.0.6002.22404_none_72f1f2b28defb2d6.manifest

File version

Not applicable

File size

10,444

Date (UTC)

13-May-2010

Time (UTC)

20:05

Platform

Not applicable


File name

Amd64_microsoft-windows-taskscheduler-engine_31bf3856ad364e35_6.0.6001.22691_none_41f43ff9909d84ea.manifest

File version

Not applicable

File size

8,359

Date (UTC)

13-May-2010

Time (UTC)

19:19

Platform

Not applicable


File name

Amd64_microsoft-windows-taskscheduler-engine_31bf3856ad364e35_6.0.6002.22404_none_443f03f18d7827c1.manifest

File version

Not applicable

File size

8,359

Date (UTC)

13-May-2010

Time (UTC)

20:08

Platform

Not applicable


File name

Amd64_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6001.22691_none_8b49115c68c5904b.manifest

File version

Not applicable

File size

116,603

Date (UTC)

13-May-2010

Time (UTC)

19:18

Platform

Not applicable


File name

Amd64_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6002.22404_none_8d93d55465a03322.manifest

File version

Not applicable

File size

116,603

Date (UTC)

13-May-2010

Time (UTC)

20:08

Platform

Not applicable


File name

Wow64_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6001.22691_none_959dbbae9d265246.manifest

File version

Not applicable

File size

108,847

Date (UTC)

13-May-2010

Time (UTC)

18:51

Platform

Not applicable


File name

Wow64_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6002.22404_none_97e87fa69a00f51d.manifest

File version

Not applicable

File size

108,847

Date (UTC)

13-May-2010

Time (UTC)

20:02

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008

File name

Update.mum

File version

Not applicable

File size

2,249

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Ia64_2d15a33152f44860c23c2803e7d67b6b_31bf3856ad364e35_6.0.6001.22691_none_0413c52d1659748e.manifest

File version

Not applicable

File size

1,062

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Ia64_44302356ae374d5dbae4373a9a0eabc7_31bf3856ad364e35_6.0.6001.22691_none_2a9e3ae2a4e10944.manifest

File version

Not applicable

File size

1,066

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Ia64_7dc93995c2af70b4dd075cea25e68584_31bf3856ad364e35_6.0.6002.22404_none_14bf3f0800a9e8a9.manifest

File version

Not applicable

File size

1,062

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Ia64_fba3c561bfb7e8334c660aef66d6e659_31bf3856ad364e35_6.0.6002.22404_none_bd2d3bf7fec87342.manifest

File version

Not applicable

File size

1,066

Date (UTC)

14-May-2010

Time (UTC)

04:54

Platform

Not applicable


File name

Ia64_microsoft-windows-taskscheduler-engine_31bf3856ad364e35_6.0.6001.22691_none_e5d7486bd83e1cb0.manifest

File version

Not applicable

File size

8,342

Date (UTC)

13-May-2010

Time (UTC)

18:42

Platform

Not applicable


File name

Ia64_microsoft-windows-taskscheduler-engine_31bf3856ad364e35_6.0.6002.22404_none_e8220c63d518bf87.manifest

File version

Not applicable

File size

8,342

Date (UTC)

13-May-2010

Time (UTC)

19:40

Platform

Not applicable


File name

Ia64_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6001.22691_none_2f2c19ceb0662811.manifest

File version

Not applicable

File size

116,582

Date (UTC)

13-May-2010

Time (UTC)

18:42

Platform

Not applicable


File name

Ia64_microsoft-windows-taskscheduler-service_31bf3856ad364e35_6.0.6002.22404_none_3176ddc6ad40cae8.manifest

File version

Not applicable

File size

116,582

Date (UTC)

13-May-2010

Time (UTC)

19:40

Platform

Not applicable

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