issue: a particular microsoft security update breaks mail merge capabilities with blackbaud products.

article: BB708164
summarized solution (from blackbaud knowledgebase):
“1.  Open the Windows Registry.
2. Locate the appropriate registry subkey (NOTE: If the WordPad registry key does not exist, it will need to be manually created):
* For 32-bit versions of Windows: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Applets\Wordpad.
* For 64-bit versions of Windows: HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Applets\Wordpad.
3. Right-Click on the WordPad key and choose New > DWORD Value.
4. Name the new DWORD value AllowConversion.
5. Right-click AllowConversion, and then click Modify.
6. Enter the number 1 in the Value Data box and click OK.”

reboot is not necessary…