Depending on the kind of integration you are using, you may want to disable the ACT Integration that will sync ACT contacts & Calender with Google or Outlook. The email sync will still continue to work.
this is Specialy recomended when using ACT on a Terminal Server or on a Citrx envoirment,
- open the windows explorer,
- go to your program files (x86) folder
- then open the ACT folder,
- then open the Act for Windows folder
- there look for Act!.Integration.exe, rename it to Act!.Integration.exe.old
- restart your pc