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
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.
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
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.
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.
Open the Office 365 portal, and sign in.
Under Get started with Office 365, click PC & Mac.
(Optional) In the Language list, select a different language.
Under Version, do one of the following:
If you’re running the 32-bit version of Windows, skip to Step 4.
If you’re running the 64-bit version of Windows, click Advanced, and then, in Version list, select 64-bit.
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