have you compacted your folders recently? File menu (alt+F) > compact folders

Yes a did. At least after the problem was there. I tried everything a senior could do!

Not quite everything....

Please before a lead you up the garden path. Copy and paste the information from the troubleshooting information on the help menu into a reply here on the forum. There is a copy to clipboard button in the troubleshooting information. just press Ctrl + V in the message window instead of typing.

hope I do well!

 Toepassingsbasics

   Naam: Thunderbird
   Versie: 24.5.0
   Useragent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0
   Profielmap: Map tonen

             (Lokaal station)
   Build-ID van de toepassing: 20140424091057
   Ingeschakelde plug-ins: about:plugins
   Buildconfiguratie: about:buildconfig
   Crashrapporten: about:crashes
   Geheugengebruik: about:memory

 E-mail- en nieuwsaccounts
   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

   account3:
     INCOMING: account3, , (pop3) pop.ziggo.nl:110, plain, passwordCleartext
     OUTGOING: smtp.ziggo.nl:587, alwaysSTARTTLS, passwordCleartext, true

 Extensies
   Test Pilot for Thunderbird, 1.3.10, true, tbtestpilot@labs.mozilla.com

 Belangrijke aangepaste voorkeuren

   Naam: Waarde

     browser.cache.disk.capacity: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     browser.cache.disk.smart_size_cached_value: 358400
     extensions.lastAppVersion: 24.5.0
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Times New Roman
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 10bfdcea-57ec-4103-8e13-1704c8908e6
     network.cookie.cookieBehavior: 2
     network.cookie.prefsMigrated: true
     places.database.lastMaintenance: 1399801258
     places.history.expiration.transient_current_max_pages: 104858
     plugin.importedState: true
     plugin.state.np32dsw: 0
     plugin.state.npctrl: 0
     plugin.state.npgoogleupdate: 0
     plugin.state.nppdf: 0
     plugin.state.npspwrap: 0
     plugin.state.npwlpg: 0
     plugins.update.notifyUser: true

 Grafisch

     Adapterbeschrijving: AMD Radeon(TM) HD 6520G
     Vendor-ID: 0x1002
     Device-ID: 0x9647
     Adapter-RAM: 512
     Adapterstuurprogramma’s: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
     Stuurprogrammaversie: 8.900.7.1000
     Datum stuurprogramma: 9-28-2011
     Direct2D ingeschakeld: false
     DirectWrite ingeschakeld: false (6.2.9200.16571)
     ClearType-parameters: ClearType-parameters niet gevonden
     WebGL-renderer: false
     GPU-versnelde vensters: 0

     AzureCanvasBackend: skia
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: none

 JavaScript

 Incrementele GC: 1

 Toegankelijkheid

   Geactiveerd: 0
   Toegankelijkheid voorkomen: 0

 Bibliotheekversies

     Verwachte minimale versie
     Gebruikte versie

     NSPR
     4.10.2
     4.10.2

     NSS
     3.15.4 Basic ECC
     3.15.4 Basic ECC

     NSS Util
     3.15.4
     3.15.4

     NSS SSL
     3.15.4 Basic ECC
     3.15.4 Basic ECC

     NSS S/MIME
     3.15.4 Basic ECC
     3.15.4 Basic ECC

from the open folder button in the troubleshooting, open the profile folder.

Navigate to the folder Mail/pop.ziggo.nl and check the size of the two files Deleted and deleted.msf. Then go to the folder Mail\Local folders and repeat

What are the respective sizes of these four files?

Hi Mat,

No files deleted or deleted.msf in mai/.pop.ziggo.nl

After the map Trash disappeared I created last week a new submap in Inbox, named Prullenbak (Trash). Size Prullenbak 70 kb, size Prullenbak.msf 4 kb

The same folders in Local folders are empty. I never use local folders.

Thanks allready for helping me, Theo

Please, Mat, can you still help any further Theo

re: No files deleted or deleted.msf in mai/.pop.ziggo.nl

please check, maybe they were called 'trash' and 'trash.msf' ?

no, there are no files trash and trash.msf as well

Very odd, usually if there is no 'Trash' file, when Thunderbird restarts it should create a new one.

Try this: open your Profile folder. close Thunderbird.

In 'Mail' / 'pop.ziggo.nl ' - where you see your Folders as files. Right click in blank space and select 'New' > 'Text Document' A file called 'New Text Document.txt' , a 'Text Document' will appear. rename this to 'Trash', with a capital T and no extension. it will say if you change a file name extension, the file may become unusable, are you sure you want to change it? Click on Yes.

close window and restart Thunderbird.

Now try to delete an email.

If the 'Trash' folder in the Folder Pane does not use the language spelling you prefer.

Right click on the 'Trash' folder and select 'Properties'. In the General Information tab: Name: type your preferred spelling do not change the location.

If you want this folder to be included in Global Search, put a check in the appropriate box Click on OK to save changes.

it works again!

there is a new Trash folder and it was automatically changed into Dutch (Prullenbak) I can delete messages in the Inbox again

the old content of Trash is gone, but that's okay

no idea what went wrong on any moment

thanks a lot for helping me, theo

I will come back in at the end.... You could check your anti virus logs, the file may well have been swept up in an anti virus scan.