When trying to link/archive an e-mail to an account, the plug-in only shows Accounts assigned to me. When being used with Sugar Professional it should show all accounts that are visible to me within Sugar.
Sugar Pro 4.5.1d
This issue could be within the plug-in or within the Sugar Pro application. The Splendid plug-in should be doing the exact same thing as the Sugar plug-in, or at least it did a year ago. Have you tried the Sugar plug-in to see what it returns?