When Microsoft Mail starts on my computer (Vista Home Premium SP1) it
sometimes takes more than 60 seconds for the Microsoft Mail startup screen
to disappear and normal email (similar to Outlook Express) becomes
available. During this time period the computer is, according to the CPU
usage indicators, doing a large amount of calculating. At other times it
starts in less than a second.

What on earth is happening during this lengthy computational period and why
was there no similar delay in XP? It is only a minor annoyance but what
advantage does Vista email offer over XP to justify the delay?

Incidentally, this delay occurs on a Vista Home Premium laptop as well as on
my desktop computer, which is relatively fast.