Probably best to post this to microsoft.public.exchange.clients as OWA (Web Outlook) is a part of Exchange, not Outlook.

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
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reading.
After furious head scratching, c asked:
| When I'm composing a new message, sometimes my web outlook window will
| temporarily lock up and I have to wait maybe 10 secs for it to become
[quoted text clipped - 6 lines]
|
| c