Default for emailing picture

How can I cange it back to Outlook Express for sending
multiple picktures from Windows Explorer

Would need a lot more information before I could make a suggestion.

Would need a lot more information before I could make a suggestion. What OS
are you running? What mail program are you currently running? Did you
un-install Outlook Express etc.
A general question like this without any information makes it impossible to
answer I am afraid.

Colin Brown
WL MVP