[JimD]

OK Here's an update. I deleted the "protected storage system provider" key from the registry of my PC, and re-entered the passwords for my email accounts into Outlook. This seems to have stemmed the tide of "Network Password" requests whenever Outlook accesses my Comcast email accounts.

I then created a new Comcast ID expressly for my iPhone, and only the iPhone accesses that mailbox; the PC never does so. I then configured my other two mailboxes to forward all messages to this third one. My iPhone is configured to fetch the contents from this mailbox every 15 minutes (best it can do with POP3 apparently).

I configured my wife's accounts the same way. I sent test messages to both her and my primary comcast accounts. Both our PCs and iPhones received the messages. Rube Goldberg would be proud.

I will use things this way for a while before I begin to experiment further.

I added thanks to you (me) :-) for your help with this.