The first time I execute the application (from within .Net) I get the following exception thrown. The Microsoft Jet database engine cannot open the file ~C:\Program Files\Blackbaud\The Raisers Edge 7\SYSDB\requex7.mdb~. It is already opened exclusively by another user, or you need permission to view its data. From the second line of code REServices reService = new REServices(); reService.Init(ref sessionContext); Subsequents execution of the application the exception is not thrown, (until I shut down and restart .Net) I have found a work around which works as an exception is not thrown on the second attempt to initiate the REServices but feels extremely cack-handed. REServices reService = new REServices(); try { reService.Init(ref sessionContext); } catch(System.Exception e) { reService.Init(ref sessionContext); } Any suggestions? Thanks Chris