When you install Skype for Business, you need to choose between a 32-bit version installer and a 64-bit version installer. Use the 32-bit installer if you’re using a 32-bit version of Windows and the 64-bit installer with a 64-bit version of Windows. To determine which version of Windows you’re using, follow the steps in Method 1 or 2. If one method doesn’t work, try the other.
Method 1: View the System window in Control Panel
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Click Start, type system in the search box, and, under Control Panel, click System.
Note: If System isn’t listed under Control Panel in the search results, click Control Panel to see more results.
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Under System, look at the System type entry. It will say either 32-bit Operating System or 64-bit Operating System.
Method 2: View the System Information window
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Click Start, type system in the search box, and, under Programs, click System Information.
Note: If System Information isn’t listed under Programs in the search results, click Programs to see more results.
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In the right pane, look at the System Type entry. For a 32-bit version operating system, it will say X86-based PC. For a 64-bit version, you’ll see X64-based PC.
To choose the installer
When you know which version of Skype for Business you need, choose the Skype for Business installer, and then install Skype for Business.
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Open the Office 365 portal, and sign in.
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Under Get started with Office 365, click PC & Mac.
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(Optional) In the Language list, select a different language.
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Under Version, do one of the following:
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If you’re running the 32-bit version of Windows, skip to Step 4.
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If you’re running the 64-bit version of Windows, click Advanced, and then, in Version list, select 64-bit.
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Click Install.
