Using Mail with Verizon iPhone 4 prevents Outlook 2007 access

Using iPhone Mail to access my Outlook 2007 account with Verizon iPhone 4 (iOS 4 mail) prevents Outlook 2007 access and returns the message below.

The problem is iOS4 multitasking which suspends the iPhone 4 mail client. Force quitting iOS4 mail restores access. How can I configure Outlook 2007 to allow multiple access? I am using Verizon CDMA for access.

Task ' - Receiving' reported error (0x8004210E) : 'Your mailbox is temporarily unavailable because another e-mail message is being delivered to it or another mail application is accessing it.  The server responded: -ERR [IN-USE] account is locked by another session or for maintenance, try again.'
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
What is the exact iOS you have on the phone?  iOS 4.0 caused problems with Exchange and yesterday Apple release v 4.3, so if you are not on 4.3 already, I would upgrade by plugging your iPhone into your computer with iTunes, upgrade iTunes and then the iPhone.
MARSPATHConnect With a Mentor Author Commented:
I have 4.2.6; I understand 4.3 not compatible w / Verizon iPhone 4; also latest iTunes; don't think I am using Exchange.
Alan HardistyCo-OwnerCommented:
Whilst grateful for the points - this problem is presumably not resolved and thus should not be closed.

Do you want to continue to troubleshoot it?
MARSPATHAuthor Commented:
Solution to upgrade to iOS 4.3 not applicable (yet) to Verizon iPhone 4.
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