Mailbox Integration Settings didn't work after upgrade to 7.0.29566 Follow

Hi,
when we did upgrade of youtrack (we have license for 50 users) from 6.0.12634 to 7.0.29566 (6.0.12634 to 7.0.28958, then to 7.0.29566) our Mailbox Integration stop working. Youtrack doesn't create new issues.

In Mailbox Integration Settings is only "Processing folder INBOX... (X days ago) " - we didn't change mail settings (in youtrack or mail server) and I checked logs on mail server - there is everything allright - user log in and log out correctly.

In youtrack's mailbox.log is

INFO [MailboxImpl ] [tzJobProcessor3] [] Start mail fetching
INFO [MailboxImpl ] [tzJobProcessor3] [] Resolving folder <default>
INFO [MailboxImpl ] [tzJobProcessor3] [] Processing folder ...
INFO [MailboxImpl ] [tzJobProcessor3] [] Processed 0 messages from
INFO [MailboxImpl ] [tzJobProcessor3] [] Processing folder INBOX...
ERROR [ailsFromMailbox_Then] [tzJobProcessor3] [] Error while processing MailServer [imaps://iHaveRealServerHere:993]
java.lang.NoSuchFieldError: SIZE
at com.sun.mail.imap.IMAPFolder.fetch(IMAPFolder.java:1171)
at jetbrains.youtrack.mailbox.fetch.EmailFetcher.fetchMessages(EmailFetcher.java:177)
at jetbrains.youtrack.mailbox.fetch.EmailFetcher.foreachImmediateMessage(EmailFetcher.java:92)
at jetbrains.youtrack.mailbox.fetch.EmailFetcher.foreachMessage(EmailFetcher.java:57)
at jetbrains.youtrack.mailbox.fetch.EmailFetcher.foreachSubfolderMessage(EmailFetcher.java:72)
at jetbrains.youtrack.mailbox.fetch.EmailFetcher.foreachMessage(EmailFetcher.java:62)
at jetbrains.youtrack.mailbox.fetch.EmailFetcher.foreachMessage(EmailFetcher.java:49)
at jetbrains.youtrack.mailbox.persistent.MailRuleImpl.process(MailRuleImpl.java:122)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl$2$1$2.invoke(MailboxImpl.java:157)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl$2$1$2.invoke(MailboxImpl.java:145)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl.connect(MailboxImpl.java:260)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl.access$000(MailboxImpl.java:54)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl$2$1.invoke(MailboxImpl.java:145)
at jetbrains.teamsys.dnq.runtime.txn._Txn.run(_Txn.java:24)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl$2.invoke(MailboxImpl.java:132)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl.doInsideFetchLock(MailboxImpl.java:338)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl.process(MailboxImpl.java:130)
at jetbrains.youtrack.mailbox.persistent.MailboxImpl.process(MailboxImpl.java:178)
at jetbrains.youtrack.mailbox.persistent.MailboxIntegration_fetchEmailsFromMailbox_Then.run(MailboxIntegration_fetchEmailsFromMailbox_Then.java:25)
at jetbrains.mps.businessRules.runtime.impl.RuleJobImpl._execute(RuleJobImpl.java:69)
at jetbrains.mps.businessRules.runtime.impl.RuleJobImpl.access$000(RuleJobImpl.java:14)
at jetbrains.mps.businessRules.runtime.impl.RuleJobImpl$1.run(RuleJobImpl.java:47)
at jetbrains.mps.businessRules.runtime.TransactionalExecutor$1.invoke(TransactionalExecutor.java:16)
at jetbrains.teamsys.dnq.runtime.txn._Txn.runNew(_Txn.java:492)
at jetbrains.mps.businessRules.runtime.TransactionalExecutor.execute(TransactionalExecutor.java:14)
at webr.framework.controller.BeanContainerAwareExecutorWrapper.execute(BeanContainerAwareExecutorWrapper.java:21)
at jetbrains.mps.businessRules.runtime.impl.RuleJobImpl.execute(RuleJobImpl.java:45)
at sun.reflect.GeneratedMethodAccessor307.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:269)
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:312)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:114)
at org.quartz.core.JobRunShell.run(JobRunShell.java:223)
at jetbrains.exodus.core.execution.RunnableJob.execute(RunnableJob.java:41)
at jetbrains.exodus.core.execution.Job.run(Job.java:99)
at jetbrains.exodus.core.execution.ThreadJobProcessor.executeJob(ThreadJobProcessor.java:132)
at jetbrains.exodus.core.execution.JobProcessorQueueAdapter.doExecuteJob(JobProcessorQueueAdapter.java:261)
at jetbrains.exodus.core.execution.JobProcessorQueueAdapter.doJobs(JobProcessorQueueAdapter.java:173)
at jetbrains.exodus.core.execution.ThreadJobProcessor.run(ThreadJobProcessor.java:110)
at jetbrains.exodus.core.execution.ThreadJobProcessor$1.run(ThreadJobProcessor.java:43)
at java.lang.Thread.run(Thread.java:745)

We running youtrack on Debian Jessie (with argumets -Xmx1024m -XX:MaxPermSize=300m and on openjdk version "1.8.0_111"). Could anyone help us please? Thanks