Exchange Server 2007 provides built-in support for asynchronous replication modeled on SQL Server's "Log shipping"[8] in CCR (Cluster Continuous Replication) clusters, which are built on MSCS MNS (Microsoft Cluster Service—Majority Node Set) clusters, which do not require shared storage. This type of cluster can be inexpensive and deployed in one, or "stretched" across two data centers for protection against site-wide failures such as natural disasters. The limitation of CCR clusters is the ability to have only two nodes and the third node known as "voter node" or file share witness that prevents "split brain"[9] scenarios, generally hosted as a file share on a Hub Transport Server. The second type of cluster is the traditional clustering that was available in previous versions, and is now being referred to as SCC (Single Copy Cluster). In Exchange Server 2007 deployment of both CCR and SCC clusters has been simplified and improved; the entire cluster install process takes place during Exchange Server installation. LCR or Local Continuous Replication has been referred to as the "poor man's cluster". It is designed to allow for data replication to an alternative drive attached to the same system and is intended to provide protection against local storage failures. It does not protect against the case where the server itself fails.

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The current version, Exchange Server 2019,[2] was released in October 2018. Unlike other Office Server 2019 products such as SharePoint and Skype for Business, Exchange Server 2019 can only be deployed on Windows Server 2019. One of the key features of the new release is that Exchange Server can be deployed onto Windows Server Core for the first time, additionally Microsoft has retired the Unified Messaging feature of Exchange, meaning that Skype for Business on-premises customers will have to use alternative solutions for voicemail, such as Azure cloud voicemail. Unified Messaging continues to exist in Exchange Online requiring an Exchange Plan 2 license.

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Rising fees on the Bitcoin network contributed to a push by some in the community to create a hard fork to increase the blocksize.[11] This push came to a head in July 2017 when some members of the bitcoin community including Roger Ver felt that adopting BIP 91 without increasing the block-size limit favored people who wanted to treat bitcoin as a digital investment rather than as a transactional currency.[12][13] This push by some to increase the block size met a resistance. Since its inception up to July 2017, Bitcoin users had maintained a common set of rules for the cryptocurrency.[12] Eventually, a group of bitcoin activists,[14] investors, entrepreneurs, developers[12] and largely China-based miners were unhappy with Bitcoin's proposed SegWit improvement plans meant to increase capacity and pushed forward alternative plans for a split which created Bitcoin Cash.[15] The proposed split included a plan to increase the number of transactions its ledger can process by increasing the block size limit to eight megabytes.[12][13]

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To keep the block generation time equal to ten minutes on average, both Bitcoin and Bitcoin Cash use an algorithm adjusting the mining difficulty parameter. This algorithm is called the difficulty adjustment algorithm (DAA). Originally, both Bitcoin and Bitcoin Cash used the same difficulty adjustment algorithm, adjusting the mining difficulty parameter every 2016 blocks. Since 1 August 2017, Bitcoin Cash also used an addition to the DAA, called an Emergency Difficulty Adjustment (EDA) algorithm. EDA was used alongside the original DAA and it was designed to decrease the mining difficulty of Bitcoin Cash by 20%, if the time difference between 6 successive blocks was greater than 12 hours.[36]

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Crypto (2019) is fairly standard DTV fare. The script tosses around a lot of buzz words about crypto currencies and money laundering. The plot involves money laundering, Russian mobsters, multi-million-dollar paintings that look as if they could have been mass-produced in a factory in Mexico alongside the paintings on velvet, murder, extortion, embezzlement, the dark web, kidnapping, and other nefarious activities, none of which makes much sense. The script offers a few clever lines of dialogue and a lot of well-worn tropes. Performances are often a bit wooden, but the camera is generally rock steady.

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Peer to peer (P2P) electronic cash is simply described as online money sent from one person to another without the need for a trusted third-party. As described in the original Bitcoin whitepaper by Satoshi Nakamoto, P2P cash makes use of digital signatures as part of the solution, but the main benefits are lost if a trusted third party is still required to prevent fraud. This makes P2P cash a trustless and safe way to transact without the need of intermediaries.

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E-mail hosted on an Exchange Server can also be accessed using POP3, and IMAP4 protocols, using clients such as Windows Live Mail, Mozilla Thunderbird, and Lotus Notes. These protocols must be enabled on the server. Exchange Server mailboxes can also be accessed through a web browser, using Outlook Web App (OWA). Exchange Server 2003 also featured a version of OWA for mobile devices, called Outlook Mobile Access (OMA).

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Support for Exchange ActiveSync (EAS) was added to Microsoft Exchange Server 2003. It allows a compliant device such as a Windows Mobile device or smartphone to securely synchronize mail, contacts and other data directly with an Exchange server and has become a popular mobile access standard for businesses due to support from companies like Nokia and Apple Inc.[14] as well as its device security and compliance features.


Exchange Server Enterprise Edition supports clustering of up to 4 nodes when using Windows 2000 Server, and up to 8 nodes with Windows Server 2003. Exchange Server 2003 also introduced active-active clustering, but for two-node clusters only. In this setup, both servers in the cluster are allowed to be active simultaneously. This is opposed to Exchange's more common active-passive mode in which the failover servers in any cluster node cannot be used at all while their corresponding home servers are active. They must wait, inactive, for the home servers in the node to fail. Subsequent performance issues with active-active mode have led Microsoft to recommend that it should no longer be used.[3] In fact, support for active-active mode clustering has been discontinued with Exchange Server 2007.

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Bitcoincash is a peer-to-peer cryptocurrency in many regards similar to Bitcoin. Coins are created and transfered using an open source cryptographic protocol and are not managed by any central authority. Thanks to the adoption of Segregated Witness, and the Lightning Network, bitcoincash has some technical advantages over Bitcoin and other major cryptocurrencies. It is capable of handling a greater number of transactions in a given time and thus reducing potential bottlenecks, as seen with Bitcoin. Also, payment cost of bitcoincash is nearly zero and it’s payment speed is approximately four times greater than that of Bitcoin.

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