This article will help you with saving passwords in Windows in order to eliminate being prompted over and over for your login information when attempting to access mapped drives, file shares, or your Hosted Exchange account. *Note that NTLM Auth is required for the RPC connection. Also, this WILL NOT WORK in Windows Home Editions.

->Using the Run command, type in “control keymgr.dll” without the quotes.

In this area you are able to add/save usernames and passwords for any domain/workgroup including using the mail server for your Hosted Exchange account.

Example when adding a credential:
-server.domain.local or server or hostname.domain.com (If all else fails, use *.domain.com or *.domain.local then login, click Save Password one more time and it will work!)
-domain\username or email address
-password

Hope this helps.