Got exactly the same situation.
Iceowl and Icedove information follows:
$ dpkg -s iceowl-extension
Package: iceowl-extension
Status: install ok installed
Priority: optional
Section: web
Installed-Size: 4752
Maintainer: Alexander Sack <a...@debian.org>
Architecture: amd64
Source: iceowl
Version: 1.0~b2-4
Depends: icedove (>= 3.0.1) | thunderbird (>= 3.0.1), calendar-timezones
(= 1.0~b2-4), libc6 (>= 2.7), libgcc1 (>= 1:4.1.1), libnspr4-0d (>=
1.8.0.10), libstdc++6 (>= 4.1.1)
Recommends: calendar-google-provider
Suggests: latex-xft-fonts
---
$ dpkg -s icedove
Package: icedove
Status: install ok installed
Priority: optional
Section: mail
Installed-Size: 38984
Maintainer: Alexander Sack <a...@debian.org>
Architecture: amd64
Version: 3.0.11-2
Replaces: icedove-gnome-support (<< 3.0-1~)
Provides: mail-reader
Depends: fontconfig, psmisc, debianutils (>= 1.16), libasound2 (>>
1.0.18), libatk1.0-0 (>= 1.29.3), libc6 (>= 2.3.2), libcairo2 (>=
1.8.8), libdbus-1-3 (>= 1.0.2), libfontconfig1 (>= 2.8.0), libfreetype6
(>= 2.2.1), libgcc1 (>= 1:4.1.1), libglib2.0-0 (>= 2.24.0), libgtk2.0-0
(>= 2.18.0), libjpeg62 (>= 6b1), libnspr4-0d (>= 4.7.0~1.9b1),
libnss3-1d (>= 3.12.6), libpango1.0-0 (>= 1.14.0), libpng12-0 (>=
1.2.13-4), libsqlite3-0 (>= 3.6.4), libstartup-notification0 (>= 0.10),
libstdc++6 (>= 4.1.1), libx11-6, libxrender1, libxt6, zlib1g (>= 1:1.1.4)
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