Yes. The address book search will display all matches for the search criteria entered in the search box. If 10 names are displayed any combination may be selected for either the To: or CC: fields. All selected addresses will be inserted into the proper field when the Use Address button is pressed.
No. At this time you cannot add names directly from a received email to the address book. You can, however, right click on the address and save it to the clipboard and paste this into the address book. Try not to be disappointed. SquirrelMail is under continual development and this might be included in the future in one form or another.
A lot of people helped out. To get a list of them, you can visit our web site squirrelmail.org.
In SquirrelMail's case it gives you access through the IMAP protocol to your email account. This means that you don't have to figure out how to setup someone else's stuff just to check your mail.
Any where there is a browser available. Wireless access (WAP/WML) is not on the drawing board at this time though.
It is doubtful that webmail will ever be a complete substitute for a regular email client. But hey, who knows? Anyway, If you ever were at a friend's house, on a trip, at home or work and away from your computer and wanted to check your mail you already know why. Because it is a huge hassle to set your mail up on their computer and then delete it again. SquirrelMail is designed to be a supplement to your normal email client.
SquirrelMail uses the IMAP protocol, info on it can be found here. The program also uses its own IMAP functions, not those built in to PHP. This won't matter to anybody except those responsible for installing it, but trust us when we say they appreciate it.