Messaging menu: sometimes it duplicates the alerts

In messaging menu, the Thunderbird add-on "Messaging Menu and Unity Launcher integration" (v0.8) alerts me about messages with Important tag and in the Inbox, but they are the same.
It should be configurable or it alerts me only about new messages in Inbox.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: thunderbird 7.0.1+build1+nobinonly-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: True
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: simon 2045 F.... pulseaudio
 /dev/snd/controlC0: simon 2045 F.... pulseaudio
BuildID: 20110929183320
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfbff4000 irq 57'
   Mixer name : 'Realtek ALC889'
   Components : 'HDA:10ec0889,1458a022,00100004'
   Controls : 39
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xfaffc000 irq 16'
   Mixer name : 'Nvidia GPU 0a HDMI/DP'
   Components : 'HDA:10de000a,10de0101,00100100'
   Controls : 16
   Simple ctrls : 4
Channel: release
Date: Mon Nov 14 14:19:41 2011
ForcedLayersAccel: False
IncompatibleExtensions: Text Link - ID={54BB9F3F-07E5-486c-9B39-C7398B99391C}, Version=4.0.2011021601, minVersion=3.0, maxVersion=3.1.*, Location=app-profile, Type=extension, Active=Yes
IpRoute:
 default via 192.168.1.1 dev eth1 metric 100
 169.254.0.0/16 dev eth0 scope link metric 1000
 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.2
 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.1
Profiles: Profile0 (Default) - LastVersion=7.0.1/20110929183320 (Running)
RfKill:

RunningIncompatibleAddons: True
SourcePackage: thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
 Nov 14 09:31:47 X58A-UD5 kernel: [127737.372272] nautilus[2067]: segfault at 10 ip 00007f9a1c144980 sp 00007fffc18d72e8 error 4 in libcairo.so.2.11000.2[7f9a1c0fe000+b9000]
 Nov 14 10:47:43 X58A-UD5 dhclient: DHCPREQUEST of 192.168.1.2 on eth1 to 192.168.1.1 port 67
 Nov 14 10:47:43 X58A-UD5 dhclient: DHCPACK of 192.168.1.2 from 192.168.1.1
 Nov 14 10:47:43 X58A-UD5 dhclient: can't create /var/lib/dhcp3/dhclient.eth1.leases: No such file or directory
 Nov 14 10:47:43 X58A-UD5 dhclient: bound to 192.168.1.2 -- renewal in 33093 seconds.
dmi.bios.date: 02/01/2011
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: FD
dmi.board.name: X58A-UD5
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFD:bd02/01/2011:svnGigabyteTechnologyCo.,Ltd.:pnX58A-UD5:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX58A-UD5:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: X58A-UD5
dmi.sys.vendor: Gigabyte Technology Co., Ltd.