Top Office 365 Solutions from Microsoft Supporthttp://support.microsoft.com/ph/15834The latest support information about Office 365 Solutions from Microsoft Product Support Services. "Lync cannot verify that the server is trusted for your sign-in address" message when you sign in to Lync 2010 by authenticating to Lync Onlinehttp://support.microsoft.com/kb/2531068#phrssLync OnlineThis dialog box is a "Trust Model Dialog" box. It is displayed when you are connecting to a server that is unknown to Lync. Lync must have your permission to verify whether to trust this server. Error message when an Office 365 user tries to sign in to Lync Online: "There was a problem acquiring a personal certificate required to sign in"http://support.microsoft.com/kb/2604176#phrssLync OnlineThis Microsoft Knowledge Base article can help troubleshoot the error "Cannot sign in to Lync." How to troubleshoot authentication and connectivity issues in Lync Onlinehttp://support.microsoft.com/kb/2541980#phrssLync OnlineThis article discusses how to troubleshoot issues that may occur when you use Microsoft Lync Online in a Microsoft Office 365 environment. You get connection errors and Outlook integration errors in Lync Onlinehttp://support.microsoft.com/kb/2436962#phrssLync OnlineWhen you install Microsoft Lync 2010 on a computer that is running Microsoft Outlook for use in a Microsoft Office 365 environment, you receive one or more of the following error messages: "There was a problem connecting to Microsoft Office Outlook." " Lync cannot connect to the Exchange server." Exchange ActiveSync client connectivity in Office 365http://community.office365.com/en-us/b/office_365_technical_blog/archive/2012/02/08/exchange-activesync-client-connectivity-in-office-365.aspx#phrssExchange OnlineCheck out this article on the EHLO blog that explains how mobile devices connect to Exchange Online (Office 365) service and how the connectivity may be impacted if the device does not support certain Exchange ActiveSync (EAS) protocol requirements. PDF Files in SharePoint Onlinehttp://community.office365.com/en-us/b/office_365_technical_blog/archive/2012/02/10/pdf-files-in-sharepoint-online.aspx#phrssSharePoint OnlineA new update allows you to open PDF files directly in Adobe Reader and the PDF file will remain connected to SharePoint Online. Troubleshooting Office 365 using the Remote Connectivity Analyzerhttp://technet.microsoft.com/en-us/edge/technet-radio-it-time-troubleshooting-office-365-using-the-remote-connectivity-analyzer#phrssTools and DiagnosticsUseful troubleshooting radio broadcast Error message when you run Office 365 Desktop Setup on a computer on which the 2007 Microsoft Office system SP3 is installed: "This update could not be installed on your computer. Error code: 17031"http://support.microsoft.com/kb/2680803#phrssDeploymentThis issue occurs because Office 365 Desktop Setup tries to install certain updates that apply to the 2007 Microsoft Office suite Service Pack 2 (SP2). However, these updates are already installed on the computer because these updates are included in the 2007 Microsoft Office suite SP3. Error message when you run Office 365 Desktop Setup: "Application cannot be started. Contact the application vendor"http://support.microsoft.com/kb/2674454#phrssDeploymentTo resolve this issue, clear the ClickOnce application cache. To do this, follow the steps in this article. Ensuring Your Network Works With Lync Onlinehttp://community.office365.com/en-us/w/lync/ensuring-your-network-works-with-lync-online.aspx#phrssLync OnlineA guide to setting Up your Lync Online networking environment. How to troubleshoot authentication and connectivity issues in Lync Onlinehttp://support.microsoft.com/kb/2541980#phrssLync OnlineThis article discusses how to troubleshoot issues that may occur when you use Microsoft Lync Online in a Microsoft Office 365 environment. Microsoft Office 365 Deployment Readiness Toolhttp://community.office365.com/en-us/f/183/p/2285/8155.aspx#phrssPlanning and DeploymentThe Office 365 Deployment Readiness Tool provides analysis of your on-premises environment in preparation for an Office 365 enterprise deployment. Prepare for single sign-onhttp://onlinehelp.microsoft.com/en-us/Office365-enterprises/ff652540.aspx#phrssOffice 365 "The computer must be joined to a domain" error message occurs when you try to install Microsoft Online Services Directory Synchronization Tool http://support.microsoft.com/kb/2419250#phrssOffice 365 How to reset a user's passwordhttp://onlinehelp.microsoft.com/en-us/office365-enterprises/ff637609.aspx#phrssOffice 365 Troubleshooting guide for the Microsoft Online Portalhttp://support.microsoft.com/kb/2437121#phrssMicrosoft Online Portal Microsoft Lync 2010 continuously asks for credentials after signing inhttp://support.microsoft.com/kb/2298541#phrssLync Online How to troubleshoot Microsoft Lync Online and Outlook integration issueshttp://support.microsoft.com/kb/2436962#phrssLync Online Error message when you try to sign in to the Microsoft Online Portal as a federated userhttp://support.microsoft.com/kb/2210944#phrssMicrosoft Online Portal Error 016: Synchronization has been stoppedhttp://support.microsoft.com/kb/2459803#phrssOffice 365How to request a Directory Service quota increase in Office 365 when you receive the "This company has exceeded the number of objects that can be synchronized" error message Checking SharePoint Online permissions for a person or sitehttp://office.microsoft.com/en-us/sharepoint-online-enterprise-help/check-permissions-for-a-person-or-site-HA101967049.aspx#phrssSharePoint Online Exchange Server Deployment Assistant Update for Exchange 2007 and Office 365 Coexistencehttp://blogs.technet.com/b/exchange/archive/2011/04/26/exchange-server-deployment-assistant-update-for-exchange-2007-and-office-365-coexistence.aspx#phrssExchange 2010 Troubleshooting Microsoft Lync Online instant messaging and presence issueshttp://support.microsoft.com/kb/2435699#phrssLync Online Troubleshoot authentication and connectivity issues in Lync Onlinehttp://support.microsoft.com/kb/2541980#phrssLync Online Compare features across the delivery models for Lync Server 2010 (on-premises), Lync Online, and Office Communications Online ("OC Online").http://community.office365.com/en-us/w/lync/480.aspx#phrssPlanningThis web site can help you decide which delivery model has the features your organization requires. The participants in a conversation cannot connect to the desktop-sharing session in Lync Onlinehttp://support.microsoft.com/kb/2386684#phrssLync Online You cannot add or connect to a Federated contact in Microsoft Lync Onlinehttp://support.microsoft.com/kb/2392146#phrssLync Online You cannot connect to Lync Online, or certain features do not work, because an on-premises firewall blocks the connectionhttp://support.microsoft.com/kb/2409256#phrssLync Online