Exchange Server is off and I can't send my new post over another POP/SMTP account

Hello,

In our company we use Exchange Server. On my personal computer at home I
have also a connection from my home Outlook 2007 to Mailbox on a company's
Exchange Server. To establish a connection to Exchange Server I must first
turn on safe connection with help of "Juniper Network Connect 6.0". And I
use connection over company's Exchange Server mostly only for my bussines
mailing.

For my home use I have also an POP/SMTP account at my local internet
provider and an IMAP/SMTP connection to my Google mail account. So in my
outlook I use three accounts.

If my safe Juniper connection to my company network is on then I can send or
receive post from all of my three accounts. And the incoming and the
outcoming post is also stored in the right folders.

If the safe connection is but off (and I don't have connection to my
company's exchange server) then I don't have any problem with receiving new
post from either account at my internet provider either from Google account.

But I have often problem to send a new post from either of my both private
accounts. I still didn't find which are the conditions, because sometimes I
can send a mail in other cases I get but the error message "The connection
to Microsoft Exchange is unavailable. Outlook must be online or connected to
complete this action." And this situation happens although I do select the
right private account for the sending.

If anybody have answer for such problem please tell me!

With regards

Ivan