I am troubelshooting an issue where if a client backup runs while Outlook is open, any PST files are skipped. One problem I have noticed is that the VSS provider does not seem to be installed on our clients. If I run a vssadmin list providers on a server where the VSS provider is installed, I get the "Galaxy VSS Provider Service". If I run this on the client, only the default Microsoft provider is listed. The subclient policy has VSS enabled for locked files only. Most of our clients have the v10 client intalled, but we are just starting to test the v11 client. Anticdotally, the first system we installed v11 on does not seem to have the issue.