I started a thread a short while ago.
The issue was that I deleted the program because I did not like the program.
I received a pop up window that requested to do a Soft Reset in order to delete the program. I pressed ok.
My Diamond turned off and then rebooted, BUT my Diamond did a Hard Reset!
Took me 7 hours to resolve this issue.
I had Data but my contacts were deleted and I could not make any phone calls. I thought I was screwed.
I posted this problem here and over on xda where Resco started a thread regarding the new version of Contacts. That is why I decided to try the program.
I never received a response from Resco.
I ended up doing a restore using Spb Backup. Saved my as*

Btw, I had purchased Resco File Explorer prior to downloading their Contact Software. I am very happy with Resco File Explorer but wasn't happy with their Contacts Software.
I still don't know why this occurred.
Someone said that it could have been a corrupted cab, etc.
Anyway, I wanted to mention the above for others to be aware of the issue.
I don't know if my issue was a fluke or if it was an issue with Resco But I suggest BACKING UP your Device just in case you want to delete the program and your Device does a Surprise Hard Reset.
My post is over at xda in the Resco Contact thread in case you want to have a look at the specifics.
There is also a thread here.The problem happened approximately 3? weeks ago.
Later on I will find them and post a link.
Here is the xda thread >
http://forum.xda-developers.com/showthread.php?t=539557
Post #10 explains the issue I had in more detail.
PPCGeeks thread I started >
http://forum.ppcgeeks.com/showthread.php?p=1058962