(1st is probably fixed, 2nd is certainly) - Calendar -

Downloading 5K events takes about 5 mins, which is ok. But subsequent "check for updates" from Outlook takes time - about 30-45 seconds - which is unacceptable for large-scale calendars.

(fixed) - Mail -

Downloading 5K mails takes about 30 mins. We do generate IDs and then, get the body content. We should perhaps consider doing this in one phase because this generates way to many IMAP requests.

• Mail -

"Downloading" 250 EMPTY mail folders takes A LOT of time. It generates THOUSANDS (15 000+ and counting) of "duplicate" IMAP requests, such as:

127.000.000.001.41964-127.000.000.001.00143: 6613 status "folder13" (UIDVALIDITY)

127.000.000.001.00143-127.000.000.001.41964: * STATUS folder13 (UIDVALIDITY 1344974869)
6613 OK Completed

127.000.000.001.41964-127.000.000.001.00143: 6614 LIST "" "folder13/%"

127.000.000.001.00143-127.000.000.001.41964: * LIST (\HasChildren) "/" folder13/folder1
6614 OK Completed (0.000 secs 5 calls)

127.000.000.001.41964-127.000.000.001.00143: 6615 status "folder13/folder1" (UIDVALIDITY)

127.000.000.001.00143-127.000.000.001.41964: * STATUS folder13/folder1 (UIDVALIDITY 1344974869)
6615 OK Completed

127.000.000.001.41964-127.000.000.001.00143: 6616 LIST "" "folder13/folder1/%"

127.000.000.001.00143-127.000.000.001.41964: * LIST (\HasChildren) "/" folder13/folder1/folder2
6616 OK Completed (0.000 secs 4 calls)

127.000.000.001.41964-127.000.000.001.00143: 6617 ENABLE QRESYNC

127.000.000.001.00143-127.000.000.001.41964: * ENABLED
6617 OK Completed

127.000.000.001.41964-127.000.000.001.00143: 6618 status "folder13" (UIDVALIDITY)

127.000.000.001.00143-127.000.000.001.41964: * STATUS folder13 (UIDVALIDITY 1344974869)
6618 OK Completed

127.000.000.001.41964-127.000.000.001.00143: 6619 LIST "" "folder13/%"

127.000.000.001.00143-127.000.000.001.41964: * LIST (\HasChildren) "/" folder13/folder1
6619 OK Completed (0.000 secs 5 calls)

127.000.000.001.41964-127.000.000.001.00143: 6620 status "folder13/folder1" (UIDVALIDITY)

127.000.000.001.00143-127.000.000.001.41964: * STATUS folder13/folder1 (UIDVALIDITY 1344974869)
6620 OK Completed

127.000.000.001.41964-127.000.000.001.00143: 6621 LIST "" "folder13/folder1/%"

127.000.000.001.00143-127.000.000.001.41964: * LIST (\HasChildren) "/" folder13/folder1/folder2
6621 OK Completed (0.000 secs 4 calls)

127.000.000.001.41964-127.000.000.001.00143: 6622 status "folder13/folder1/folder2" (UIDVALIDITY)

127.000.000.001.00143-127.000.000.001.41964: * STATUS folder13/folder1/folder2 (UIDVALIDITY 1344974870)
6622 OK Completed

127.000.000.001.41964-127.000.000.001.00143: 6623 LIST "" "folder13/folder1/folder2/%"

127.000.000.001.00143-127.000.000.001.41964: * LIST (\HasChildren) "/" folder13/folder1/folder2/folder3
6623 OK Completed (0.000 secs 3 calls)

folders have a structure like

folder0
folder0/folder1
folder0/folder1/folder2
folder0/folder1/folder2/folder3
folder0/folder1/folder2/folder3
folder0/folder1/folder2/folder3/folder4
folder0/folder1/folder2/folder3/folder4/folder5
folder1/folder1
folder1/folder1/folder2
...

OpenChange is dead - setting for removal from SOGo.