I've download Plaxo two days ago. Designers have make a good work. It is a really pleasure to look at Plaxo. But... after installation of Plaxo, Outlook rules wizard start showing error messages, and I've got a lot of duplicates (it is very good that I have Duplicate Email Remover ;-) I've turn off the Plaxo add-in, and all transports are stop working! And some hell happen in Send/Receive menu. I've escaped by reboot only.

Today I've debug my own add-in for Outlook, but debug output is overloaded by Plaxo messages (diagnostic log of Plaxo is turned off):

[1464] [PLAXO 02/11 16:35:58 0x0c94] [ProcessFolder] Calendar
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ScanItems]  folder ignored: Calendar (default: 1)
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ProcessFolder] Contacts
[1464] [PLAXO 02/11 16:35:58 0x0c94] [QueryFull] running full query
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ScanItems] scanning folder: Contacts  (9 items,  default: 1)
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ProcessFolder] x
[1464] [PLAXO 02/11 16:35:58 0x0c94] [QueryFull] running optimized query
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ScanItems] scanning folder: x  (230 items,  default: 0)
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ProcessFolder] Notes
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ScanItems]  folder ignored: Notes (default: 1)
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ProcessFolder] Tasks
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ScanItems]  folder ignored: Tasks (default: 1)
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ProcessFolder] MAPILab Ltd. - Vacation Calendar
[1464] [PLAXO 02/11 16:35:58 0x0c94] [ScanItems]  folder ignored: MAPILab Ltd. - Vacation Calendar (default: 0)
[1464] [PLAXO 02/11 16:35:58 0x0c94] [DiskCommit] folderMgr writing out
[1464] [PLAXO 02/11 16:35:58 0x0c94] [DiskCommit] folderMgr writing out: succeeded
[1464] [PLAXO 02/11 16:35:58 0x0c94] **************************** Took 0 seconds to scan address book
[1464] [PLAXO 02/11 16:35:58 0x0c94] Analyzed Alerts: 6 actions generated
[1464] [PLAXO 02/11 16:35:59 0x08e4] [CEventMgr::Run] message with NULL hwnd (could've been lost): 0x0 0x113 0x132a 0x0
[1464] [PLAXO 02/11 16:35:59 0x08e4] [CEventMgr::Run] message with NULL hwnd (could've been lost): 0x0 0x113 0x1328 0x0
[1464] [PLAXO 02/11 16:36:08 0x08e4] [CEventMgr::Run] message with NULL hwnd (could've been lost): 0x0 0x113 0x14b1 0x0
[1464] [PLAXO 02/11 16:36:30 0x0d10] [OnNewExplorer] 0x602
[1464] [PLAXO 02/11 16:36:31 0x0d10] OnViewSwitch
[1464] [PLAXO 02/11 16:36:31 0x0d10] Analyzed Alerts: 6 actions generated
[1464] [PLAXO 02/11 16:36:32 0x0d10] [OnNewInspector] 0x702

Huh... I'll uninstall it today. Pitifully. I'll try another product.