Integration with SourceSafe was one of the major reasons we chose TP.
The integration used to work some of the time. Now we cannot get it to work at all.
I have been posting issues on this topic for more than TWO YEARS. I have yet to receive any satisfactory answer.

In general, I can set up the profiles such that "Check Connection" succeeds, and "Sync now" causes a message "Synchronization was started successfully ... " that is correct. However, the "Sync now" never seems to complete (even if I use a SourceSafe project that is almost empty and with few revisions), and nothing appears in the low. If I enable a profile, the log gradually accumulates messages of the form "Errors: File or project not found", or "Errors: A history operation is already in progress", or "Exception of type 'System.OutOfMemoryException' was thrown".

What I need is MORE INFORMATION: better diagnostics (which file/project is missing?), more detailed logging, steps to diagnose.

Please help.

FURTHER INFORMATION:
After a very long wait, an attempt to do a "Sync now" with a small SourceSafe repository that began with a "Synchronization was started successfully ..." message resulted in an ADMIN log entry below:
at Tp.Integration.SourceControl.SourceControlIntegration`1.Synchronize(Int32 pluginProfileID)
at Tp.Integration.SourceControl.SourceControlIntegration`1.GetNotImportedRevisions(Int32 pluginProfileID)
at Tp.Integration.SourceControl.SourceSafe.SourceSafeService.GetRevisionInfos(Int64 fromChangeset, Int64 toChangeset)
at Tp.Integration.SourceControl.SourceSafe.SourceSafeService.GetRevisionInfos(String path, Int64 fromChangeset, Int64 toChangeset)
at Microsoft.VisualStudio.SourceSafe.Interop.IVSSVersion.get_VSSItem()
System.Runtime.InteropServices.COMException (0x8004D68F): File or project not found
2010-07-23 14:01:59,839 [8] ERROR Tp.Integration.SourceControl.SourceControlIntegration`1[[Tp.Integration.SourceControl.SourceSafe.Settings, Tp.Integration.SourceControl.SourceSafe, Version=2.16.2.14728, Culture=neutral, PublicKeyToken=ee2a1130677e5334]] - Error synchronizing project 'IO' with source control